Modding Halo Xbox Maps For Mc Jump Height/speed

I keep trying to mod multiplayer maps to change the Masterchiefs jumpheight and speed. I'd prefer to do this so without using the cache. IE changing the map (chillout) so everytime I load I still have the mod. I've tried to change the values in Halo Hacker Tools but when I recompress and move it over to the Xbox, I don't notice any difference. Can someone help me out with this?

Also I haven't tried editing the cache files yet, does anyone know if its possible to edit player jump height/speed, or things like weapon spread, or melee damage through the cache? Thanks ahead of time.